PVC cua sov stabilizersUa lub luag haujlwm tseem ceeb hauv kev ua kom cov kav dej PVC ua haujlwm tau zoo thiab ruaj khov. Cov tshuaj stabilizer no yog cov khoom siv ntxiv uas siv los tiv thaiv cov khoom siv PVC kom tsis txhob puas tsuaj los ntawm kev raug cua sov, lub teeb thiab oxygen. Hauv tsab xov xwm no, peb yuav tshawb nrhiav kev siv cov tshuaj stabilizer kub PVC hauv cov kav dej PVC thiab lawv qhov tseem ceeb rau kev tswj cov kav dej zoo.
PVC, los yog polyvinyl chloride, yog ib yam khoom siv tau ntau yam uas feem ntau siv hauv kev lag luam kev tsim kho rau ntau yam kev siv, suav nrog cov kav dej, cov khoom sib txuas thiab cov kav dej. Cov kav dej PVC siv dav hauv kev muab dej, kev ntws dej, kev ywg dej thiab cov dej phwj vim lawv lub zog ruaj khov, tiv taus kev xeb, thiab yooj yim rau kev teeb tsa. Txawm li cas los xij, cov ntaub ntawv PVC feem ntau yuav lwj thaum raug cua sov thiab lub teeb, ua rau poob lub zog kho tshuab thiab xim ploj.
Yuav kom kov yeej qhov teeb meem no, cov tshuaj stabilizer PVC kub yog siv los tiv thaiv cov khoom siv PVC los ntawm kev puas tsuaj thermal thaum lub sijhawm ua thiab kev pabcuam ntawm cov kav dej PVC. Lub hom phiaj ntawm cov tshuaj stabilizers no yog los tiv thaiv cov tshuaj tiv thaiv kev puas tsuaj uas tshwm sim thaum PVC raug cua sov thiab lub teeb, yog li ua kom lub neej ua haujlwm ntawm cov kav dej ntev dua thiab tswj nws cov khoom siv kho tshuab.
Muaj ntau hom PVC heat stabilizers siv rau cov kav dej PVC, suav nrog cov lead-based stabilizers, tin-based stabilizers, calcium-based stabilizers thiab organic-based stabilizers. Txhua hom stabilizer muaj nws cov yam ntxwv thiab cov txiaj ntsig tshwj xeeb, thiab kev xaiv cov stabilizer tsim nyog tshaj plaws nyob ntawm qhov xav tau tshwj xeeb ntawm koj daim ntawv thov PVC yeeb nkab.
Cov khoom ruaj khov uas muaj cov hlau lead, xws li lead stearate thiab lead trivalent sulfate, tau siv dav heev yav dhau los vim lawv qhov kev ruaj khov zoo heev thiab kev siv nyiaj tsim nyog. Txawm li cas los xij, vim muaj kev txhawj xeeb txog ib puag ncig thiab kev noj qab haus huv, ntau lub tebchaws tau tshem tawm kev siv cov tshuaj stabilizers uas muaj cov hlau lead thiab hloov lawv nrog lwm cov tshuaj stabilizers.
Cov stabilizers raws li Tin, xws li dibutyltin dilaurate thiab tributyltin oxide, paub txog lawv qhov kev ruaj khov thermal siab thiab kev meej, ua rau lawv haum rau cov ntawv thov uas qhov tseem ceeb ntawm kev khaws xim. Cov stabilizers no kuj tiv thaiv cov yeeb nkab PVC kom tsis txhob puas thaum lub sijhawm ua thiab sab nraum zoov.
Cov tshuaj stabilizers uas muaj calcium xws li calcium stearate thiabcov tshuaj calcium zinc stabilizers, yog cov tshuaj uas tsis muaj tshuaj lom rau cov tshuaj stabilizers uas muaj cov hlau lead thiab feem ntau siv rau hauv kev tsim cov kav dej PVC rau dej haus thiab ntim khoom noj. Cov tshuaj stabilizers no muaj kev ruaj khov zoo thiab tiv taus huab cua, ua rau lawv haum rau kev siv sab nraum zoov.
Cov tshuaj stabilizer organic, xws li roj taum pauv epoxidized thiab methyltin mercaptide, yog los ntawm cov khoom ntuj thiab nrov vim lawv cov khoom zoo rau ib puag ncig thiab tsis muaj tshuaj lom. Cov tshuaj stabilizer no tiv thaiv cov kav dej PVC kom tsis txhob puas tsuaj los ntawm cua sov thiab tsim nyog rau cov ntawv thov uas muaj cov cai ib puag ncig nruj.
Thaum lub sijhawm tsim cov kav dej PVC, cov tshuaj tiv thaiv cua sov PVC raug ntxiv rau hauv cov roj PVC thaum lub sijhawm sib xyaw ua ke kom ua rau muaj kev sib xyaw ua ke. Cov tshuaj tiv thaiv zoo tiv thaiv kev puas tsuaj los ntawm cua sov thiab lub teeb los ntawm kev tsim cov khoom sib xyaw nrog PVC polymer saw. Qhov no ua kom ntseeg tau tias cov kav dej PVC tswj tau nws lub zog, xim ruaj khov thiab qhov ntev thoob plaws nws lub neej kev pabcuam.
Thaum lub sijhawm ua haujlwm ntawm cov kav dej PVC, kev raug rau cov yam ntxwv sab nraud xws li lub hnub ci, qhov kub thiab txias hloov pauv, tshuaj lom neeg, thiab lwm yam yuav ua rau cov khoom siv PVC puas tsuaj sai dua. Cov khoom siv cua sov PVC ua lub luag haujlwm tseem ceeb hauv kev tiv thaiv cov kav dej los ntawm cov yam ntxwv no, ua kom lawv ua haujlwm tau ntev thiab ntseeg tau.
Kev siv cov khoom siv PVC heat stabilizers yog qhov tseem ceeb rau kev tswj hwm qhov zoo thiab kev ua tau zoo ntawm cov kav dej PVC. Cov khoom siv stabilizers no tiv thaiv cov khoom siv PVC los ntawm kev puas tsuaj thermal thiab xyuas kom meej tias cov kav dej tswj hwm nws cov khoom siv kho tshuab, xim ruaj khov thiab qhov ntev. Raws li cov thev naus laus zis stabilizer nce qib, tam sim no muaj ntau yam kev xaiv los ua kom tau raws li cov kev xav tau tshwj xeeb ntawm cov ntawv thov yeeb nkab PVC sib txawv. Raws li qhov kev thov rau cov kav dej PVC zoo thiab ruaj khov txuas ntxiv mus, qhov tseem ceeb ntawm PVC heat stabilizers hauv kev lag luam yeeb nkab PVC tsis tuaj yeem ua dhau.
Lub sijhawm tshaj tawm: Lub Ib Hlis-10-2024